SC1138 – ShellCheck Wiki

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Remove spaces between (( in arithmetic for loop.

Problematic code:

for( (i=0; i<10; i++) ); do echo $i; done

Correct code:

for((i=0; i<10; i++)); do echo $i; done

Rationale:

ShellCheck finds arithmetic for ((;;)) expressions where (( or )) are intervening with spaces

Exceptions:

None

Related resources:

• Help by adding links to BashFAQ, StackOverflow, man pages, POSIX, etc!

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